Circuits & Schematics: -Wire Barometer 5/10 Volt Design vrs - 2

11. Over-temperature micro-power alarm
    David A. Johnson
    Circuits Measurement Digital Texas Instruments CD4013B
    .. circuit is powered for years by a single 3 volt lithium battery. It sounds an alarm when the temperature exceeds a certain point. With some minor changes the ...
    May 14, 2026

12. Well-balanced gain, driven without pain
    Nick Cornford
    Circuits Analogue Design Amplifiers Texas Instruments LM4562
    .. to a standard circuit can enhance its usefulness and even save a resistor. If there were a prize for the most trivial Design Idea (DI) of the year, this one would likely be high on the shortlist (if not at the top). Most DIs involve ...
    May 13, 2026
13. Single switch controls sequential operation of multiple power supplies
    Jayapal Ramalingam
    Circuits Supply Texas Instruments LM393
    .. goes LOW, turning Q1 and Q2 OFF. The 5 V output, switched OFF last, implements the desired FILO sequence. Notably, this design doesn’t employ a constantly power-consuming watchdog circuit. For different time delays, accordingly ...
    May 12, 2026
14. Infrared remote control decoder & switcher using Arduino
    Hesam Moshiri
    Circuits Arduino Wireless Atmel ATtiny85
    .. be programmed by the user. I used Altium Designer 21.4.1 and the SamacSys component libraries (SamacSys Altium Plugin) to design the Schematic and PCB. I also used the Siglent SDS2102X Plus/SDS1104X-E to analyze the IR signals. The device ...
    May 7, 2026
15. ΔV_BE thermometer outputs 1 mV/°C without calibration or op amps
    Stephen Woodward
    Circuits Analogue Design Measurement NXP 74HC4053
    .. that is. But consider this. If it’s impractical to get enough ΔV BE signal from a single junction, why not wire N junctions in series and let their signals add up? For example, if N = 5, then to get the required 1 mV/5 = 0.2 ...
    .. amps tend to make analog design easy. Maybe sometimes too easy? Don’t get me wrong. I like operational amplifiers. Some of my best ...
    May 7, 2026
16. I built a 100W stereo class-D amplifier using TPA3221
    Sagar Saini
    Circuits Audio Amplifiers Texas Instruments TPA3221
    .. analog-in, speaker-out power amplifier that I could pair with any source. In this article, I will walk you through the full design. Why TPA3221? There are dozens of Class-D amplifier ICs out there. The TPA3116, TPA3255, MAX98400 but the ...
    May 6, 2026
17. ΔVbe + DMM = Celsius, Kelvin, Fahrenheit, and Rankine thermometer
    Stephen Woodward
    Circuits Measurement Linear Technology LTC2066
    .. temperature sensor with a standard digital multimeter can make an inexpensive, accurate, and useful thermometer. A recent Design Idea, BJT is accurate sensor for absolute temperature in Kelvin and Rankine ( Ref. 1 ), was based on a 1991 ...
    Apr 30, 2026
18. BJT is accurate sensor for absolute temperature in Kelvin and Rankine
    Stephen Woodward
    Circuits Analogue Design Measurement NXP 74HC4053
    .. ΔV BE temperature measurement is aptly described and applied here ( Ref. 1 ) by famed and forever remembered analog design guru Jim Williams (see page 7): At room temperature, the V BE junction diode shifts 59.16 mV per decade of ...
    Apr 30, 2026
19. Linearly variable two-wire loop current generator
    Jayapal Ramalingam
    Circuits Measurement Interfaces Texas Instruments LM124
    .. such as the design described here implement useful tools for a diversity of calibration and testing applications A two-wire loop current generator is a useful tool for the testing, calibration and commissioning of current-to-pressure ...
    Apr 24, 2026
20. Tiny continuity tester
    David Johnson-Davies
    Circuits Measurement Microcontrollers Usage Microchip ATtiny202
    .. I've used a slightly larger battery, the CR1025, and a battery holder which gives a more reliable connection than the wire clip used on the original. The circuit drives the piezo speaker in bridged mode from two outputs, to make it ...
    .. button cell, and automatically switches itself off when not in use, avoiding the need for an on/off switch. Introduction I design many of my projects for my own use, and the original Continuity Tester is one of the ones I use the most, to ...
    Apr 16, 2026

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